Process of manufacturing watch crown-pieces



(No Model.)

A. G. DALZELL, J1

No. 435,802. Patented Sept. 2, 1890.

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ALLAN DALZELL, JR, OF' SAG HARBOR, NEIV YORK.

PROCESS OF MANUFACTURING WATCH CROWN-PIECES.

SPECIFICATION forming part of Letters Patent No. 435,802, datedSeptember 2, 1890.

Application filed December 16, 1889. Serial No. 333,956. (No specimens.)

To all whom, it may concern:

Be it known that I, ALLAN O. DALZELL, J r., of Sag Harbor, in the countyof Suifolk and State of New York, have invented a new and useful Processof Manufacturing \Vatch Crown-Pieces, of which the following is a full,clear, and exact description. A

My invention relates to improvements in the manufacture of watchcrown-pieces, of crown-cores for the same, and in the manner ofattaching the crown-shells to said cores; and the object of my inventionis to provide an improved watch crown-piece and a cheap and efficientprocess of manufacturing crowncores and of attaching the shells to thesame.

To this end my invention consists in a watch crown-piece and in theprocess of man ufacture, which will be hereinafter fully described, andspecifically pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, which illustrate the articles at different stages ofmanufacture, and in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is a side and end elevation of a rod from which the saidcrown-cores are cut; Fig. 2, a side and end view of said rod withcorrugations upon its surface; Fig. 3, a longitudinal section of thecorrugated rod, showing a crown-core cut therefrom; Fig. 4, alongitudinal section of a crown core and shell, the crown-core beinginserted in the shell ready to have the shell closed upon it; and Fig.5, the same section, but with the crownshell closed over the crown-core.

The crown-pieces consisting of the shell A and core B, with stem B, areattached to stemwinding watches, the watch-pendant being slipped overthe stem B, and the crown-piece serving as a handle to turn the windingmechanism, the core B being inserted in the crownshell A to stiffen thesame.

My process of manufacture is as follows: I take a rod 0, of brass orother suitable material, of the same diameter as the crown-core A, anddraw it through an especially-prepared draw-plate, which corrugates saidrod throughout its entire length, the corrugations being of the samesize as the corrugations of the crown-shell A. The rod is then placed ina suitable screw machine or lathe, which turns the stem B to fit thewatch-pendant and which chambers the crown-core B around the inner endof the stem B, as shown in the drawings, the chamber a thus formed beingdeepest next the stem and tapering to the edge of the crown-piece. Aforming-tool is then brought against the rod 0, which rounds the outerend of the core B, forms a nipple b thereon, and cuts the core from therod. The corrugations will thus be left on a little more than half theouter surface of the core B- i. 6., on the part not rounded by theformingtool. The crown-piece is then placed in the crown-shell A, whichis of the usual construction, being a hollow corrugated shell open atone end, so that the corrugations of the core will fit the corrugationsof the crown-shell, and the nipple b will fit into acorresponding socketb at the inner end of the crown-shell A. The crown-core B and shell A'are then placed in a device which closes the shell over the core andcrushes in the chambered end of the core B upon the stem B, thus firmlyuniting the core B and shell A and forming a smooth oval crown-piece, asshown in Fig. 5.

I have not shown the machinery for manufacturing the crown-piece, as Iclaim the process above described and the crown-piece manufactured inthis way without regard to the machinery employed.

Having thus fully described my invention, I claim as newand desire tosecure by Letters Patent 1. The herein-described process ofmanufacturing watch crown-pieces, which consists, essentially, incorrugating a rod of the same diameter as the watch crown-core, placingsaid rod in a suitable machine, and turning the stem and chambering oneend of the crowncore around said stem, and bringing a forming-toolagainst said rod, so as to round the other end of the crowncore and cutthe core from the rod, substantially as described.

2. The herein-described process of manufacturin g watch crown-pieces,which consists, essentially, in corrugating a rod of the same diameteras the crown-core, placing said rod in a suitable machine, and turningthe stem and chambering one end of the crown-core around said stem,bringing a forming-tool against said rod, so as to round the other endof the crown and cut the core from the rod, placing said crown-core inthe crown-shell, and closing said shell and chambered end of the corearound the stem of said core, substantially as described.

3. In the manufacture of Watch crownpieces, the herein-described processof attaching the crown-shell to the crown-core, which consists,essentially, in placing a crown-core having one end chamber-ed aroundthe stem thereof in the crown-shell and closing said crownshell andchambered end of the crowncore around the stern of the crown-core,Substantially as described:

ALLAN C. DALZELL, J R. Witnesses:

HARRY A. STEVENSON, JOHN WQSPATOHER.

